918899999 has 4 divisors (see below), whose sum is σ = 923564664. Its totient is φ = 914235336.

The previous prime is 918899987. The next prime is 918900001. The reversal of 918899999 is 999998819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999998819 = 1831 ⋅546149.

It is a cyclic number.

It is not a de Polignac number, because 918899999 - 2²⁰ = 917851423 is a prime.

It is a Duffinian number.

918899999 is a modest number, since divided by 99999 gives 9188 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918899909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2332037 + ... + 2332430.

It is an arithmetic number, because the mean of its divisors is an integer number (230891166).

Almost surely, 2^918899999 is an apocalyptic number.

918899999 is a deficient number, since it is larger than the sum of its proper divisors (4664665).

918899999 is a wasteful number, since it uses less digits than its factorization.

918899999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4664664.

The product of its digits is 34012224, while the sum is 71.

The square root of 918899999 is about 30313.3633732715. The cubic root of 918899999 is about 972.2010452934.

The spelling of 918899999 in words is "nine hundred eighteen million, eight hundred ninety-nine thousand, nine hundred ninety-nine".